Difference between revisions of "CDC time spikes"

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Prototype at 2100V, 50/50 Ar/CO2
 
Prototype at 2100V, 50/50 Ar/CO2
 
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|[[Image:prototype_45deg.jpg|thumb|x150px|Tilted prototype]]
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|[[Image:prototype_45deg.jpg|thumb|x250px|Tilted detectors]]
 
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Revision as of 17:25, 13 November 2012

Prototype at 2100V, 50/50 Ar/CO2

Tilted detectors


Trigger signals

Scint and coinc logic signals, scope triggered on coinc (magenta)
Same, with TI busy signal (green)
Same, different timebase


Histograms of threshold-crossing bins in central bank of 16 straws, different thresholds (ignore the histo titles)

ADC-value=150 crossing (~approx ped + 5sigma)
3.5sigma crossing (approx ADC value 112 = (55 + 3x16.5))
ADC-value=100 crossing


Histograms of ADC value=100 threshold-crossing bins in individual straws (search started at bin 160)

ADC-value=100 crossing

Same data after more normal analysis (Search forward to find pedestal+5sigma crossing, then backwards to find 4sigma and then 1sigma crossings)

5sigma crossing
4sigma crossing
1sigma crossing
extrapolation to local pedestal crossing
drift time (ns)

ADC=100 crossing bins plotted for all straws against one particular straw

straw 0